Publications

2000

• Thermodynamical description of moving discontinuities : applications to fracture and wear
  
  • Stolz C.
  , 2000. No abstract provided
• Influence of thickness on crystallographic and mechanical properties of PVD tungsten coatings
  
  • Ganne T.
  • Crépin Jérôme
  • Zaoui A.
  • Pradeilles-Duval R. M.
  , 2000, pp.413-418. No abstract provided
• Mathematical Aspects of Boundary Element Methods
  
  • Bonnet Marc
  , 2000. (10.1201/9780429332449)
  DOI : 10.1201/9780429332449
• La bonne tension des cordes
  
  • Luong Minh-Phong
  Revue européenne des textiles à usages techniques, sports et loisirs, 2000, 36, pp.48-50.
• Intelligent numerical simulations in engineering problems
  
  • Zarka J.
  , 2000.
• An example of stick-slip waves
  
  • Moirot Franck
  • Son Nguyen Quoc
  Comptes Rendus de l'Academie des Sciences Serie II, Gauthier-Villars, 2000, 328, pp.663-669. An analytical solution representing a family of stick-slip waves is obtained in a simple example modeling the dynamic behaviour of an elastic tube in contact with Coulomb friction with a rigid rotating cylinder. This family of waves represents the auto-excited periodic responses of the system. (10.1016/S1620-7742(00)01238-1)
  DOI : 10.1016/S1620-7742(00)01238-1
• Dynamic testing of fibre polymer matrix composite plates under in-plane compression
  
  • Gary Gérard
  • Zhao H.
  Composites Part A: Applied Science and Manufacturing, Elsevier, 2000, 31, pp.835-840. Experimental investigations of the failure strength of fibre reinforced polymer matrix composite plates under compressive impact loading is presented in this paper. A split Hopkinson pressure bar (SHPB) is used to measure these properties. The specimen being a plate, its cross-sectional area is small compared with the area of the bars and the failure strength is weak. One has to then use low impedance bars made of a viscoelastic material. Subsequent experimental problems, such as dispersion corrections in viscoelastic bars, are analysed. One also has to use a special anti-buckling device to prevent the overall buckling of the specimen. It is shown that the presented SHPB system provides a precise measurement of forces and displacements at both ends of the specimen. A special attention is then given to the analysis of the test, especially in situations where a non-homogeneous state of stress in the specimen in observed. (10.1016/S1359-835X(00)00026-9)
  DOI : 10.1016/S1359-835X(00)00026-9
• On a new methodology for quantitative modeling of fretting fatigue
  
  • Dang Van Ky
  • Maitournam Habibou
  , 2000, pp.538-552. A new intrinsic methodology for the prediction of fretting fatigue failure of a structure is presented. It is based, first, on the evaluation of local relevant thermomechanical parameters by new thermoelastoplastic computational methods (direct cyclic method) and, second, on the systematic use of the Dang Van multiaxial high-cycle fatigue criterion. For the validation of this proposal, numerical simulations of fretting fatigue tests on a particular experimental setup considered as a structure are performed. The resulting prediction of the experimental fretting fatigue map in relation to plastic and fatigue material properties is good. (10.1520/STP14753S)
  DOI : 10.1520/STP14753S
• Thermomechanical description of moving discontinuities: Application to wear
  
  • Stolz Claude
  , 2000. The propagation of moving surface inside a body is analysed within the framework of thermomechanical couplings, when the moving surface is associated with an irreversible change of mechanical properties.The moving surface is a surface of heat sources and of entropy production, intensities of which are related to particular energy release rates defined in terms of Hamiltonian gradients. As examples, we analyse the evolution of partial damage in a composite sphere and a model for study the contact wear phenomena between two bodies.
• Brake squeal: a problem of flutter instability of the steady sliding solution ?
  
  • Moirot Franck
  • Son Nguyen Quoc
  Archives of Mechanics, 2000, 4-5, pp.645-662. Brake squeal results from friction-induced vibrations. This phenomena is considered here and interpreted as a flutter instability of the steady sliding solution of an elastic solid in unilateral contact with friction with a moving obstacle. A mechanical analysis of the governing equations is given, in particular to obtain the steady sliding solution. The stability analysis of this solution is discussed. A numerical analysis by the finite element method is performed in order to compute the steady sliding solution and to discuss its stability for an automotive disk brake. The validation of the numerical procedure is examined in relation with some analytical results of the literature.
• Science et règlement
  
  • Salençon Jean
  , 2000, pp.213-221.
• A critical study of SHPB test on the materials involved in crash problems
  
  • Zhao H.
  • Gary G.
  , 2000. No abstract provided
• Plasticity of zirconium at intermediate temperatures: effect of a small quantity of sulfur
  
  • Ferrer F.
  • Bretheau Th.
  • Crépin Jérôme
  • Barbu A.
  , 2000. No abstract provided
• Resource-bounded relational reasoning: induction and deduction through stochastic matching
  
  • Sebag Michèle
  • Rouveirol Céline
  Machine Learning, Springer Verlag, 2000, 38 (1-2), pp.41-62. One of the obstacles to widely using first-order logic languages is the fact that relational inference is intractable in the worst case. This paper presents an any-time relational inference algorithm: it proceeds by stochastically sampling the inference search space, after this space has been judiciously restricted using strongly-typed logic-like declarations. We present a relational learner producing programs geared to stochastic inference, named STILL, to enforce the potentialities of this framework. STILL handles examples described as definite or constrained clauses, and uses sampling-based heuristics again to achieve any-time learning. Controlling both the construction and the exploitation of logic programs yields robust relational reasoning, where deductive biases are compensated for by inductive biases, and vice versa. (10.1023/A:1007629922420)
  DOI : 10.1023/A:1007629922420
• Intelligent modelling of woven materials
  
  • Zarka Joseph
  • Doux Thierry
  , 2000.
• Optimal design of a beam with a direct link to CAD
  
  • Zarka J.
  • Hablot J. M.
  , 2000. No abstract provided
• Quelques exemples de vibrations et d'instabilité induites par le frottement
  
  • Nguyen Q. S.
  , 2000. No abstract provided
• Intelligent optimal design of naval structures: is it possible ?
  
  • Zarka J.
  , 2000. No abstract provided
• Percolation mécanique'' : pertinence des modèles classiques en viscoélasticité linéaire et nouvelles approches
  
  • Bornert Michel
  • Aussant F.
  • Zaoui A.
  , 2000. No abstract provided
• On the role of fluids in the cracks of elastic materials
  
  • Feraille Fresnet Adélaïde
  • Bui Huy Duong
  • Ehrlacher Alain
  , 2000, pp.53-64.
• Field Data vs. Theoretical Model to Quantify Drilling Efficiency and Disruption
  
  • Putot Claude
  • Perreau Philippe
  • Constantinescu Andrei
  SPE Drilling and Completion, Society of Petroleum Engineers, 2000, 15, pp.118-124. Mechanical and kinematics data at the bit have been collected during drilling operations and organized to identify optimal drilling efficiency. Transitional conditions towards abnormal behavior have been distinguished. Normal drilling is usually characterized by regular linear relationships between global control variables at the bit, which approximately correspond to an up scaling of a local Mohr Coulomb type failure mechanism of the rock. Most of our experimental data confirm this classical disposition. However, considerable departure from these relationships is noted, especially when there is BHA resonance or when there is partial balling at the bit. The field tests presented here allows us to verify classical theory and to draw up new guidelines for behavior in non- optimal or dangerous, evolving operating conditions, such as those that occur under poor cleaning conditions. The main features of a mechanical structuring model involving transition towards low efficiency conditions are presented, and it is shown how this model confirms our interpretation of field data. The model couples the drillability of rock and the general dynamics of the bit in an original and synthetic way. It makes it possible to understand and test the sensitivity of bit response to variables such as "weight on hook", torque on the drillstring and flow rate of the fluid. (10.2118/50579-MS)
  DOI : 10.2118/50579-MS
• Nondestructive damage evaluation of reinforced concrete structure using infrared thermography
  
  • Luong Minh-Phong
  , 2000, pp.98-107. This paper highlights three advantages of infrared thermography as a nondestructive, non-contact and in real-time technique. It permits first observation of the physical manifestation of damage and the mechanism of failure of concrete, second detection of the occurrence of intrinsic dissipation localization, and third evaluation of the fatigue strength in a very short time, compared to traditional testing techniques. In addition, infrared thermography readily describes the damage location and the evolution of structural failure. The investigated parameter is heat generation due to intrinsic dissipation of concrete subject to compressive loading. Owing to the thermomechanical coupling, this technique provides a simple means for evaluating fatigue strength and for discriminating diverse dissipative phenomena. (10.1117/12.385481)
  DOI : 10.1117/12.385481
• Deriving adequate formulations for fluid-structure interaction problems : from ALE to transpiration
  
  • Fanion Thierry
  • Fernández Miguel Angel
  • Le Tallec Patrick
  Revue Européenne des Éléments Finis, HERMÈS / LAVOISIER, 2000, 9 (6-7), pp.681-708. Most formulations describing low speed large displacements fluid-structure interaction problems use a totally lagrangian formulation for the structure, and an Arbitrary Euler Lagrange (ALE) formulation for the fluid. The purpose of the present paper is to review the derivation of such formulations, to describe different time discretisation strategies and to explain the type of numerical problems which arise when implementing these techniques. To overcome all technical difficulties arising when dealing with moving grids, we will also explain how an adequate asymptotic expansion can reduce the problem to a standard problem written on a fixed conf iguration, but using specific transpiration interface boundary conditions. This last formulation is rather popular in the aeronautical community, and will be illustrated by various numerical experiments. (10.1080/12506559.2000.10511481)
  DOI : 10.1080/12506559.2000.10511481
• A discrete dislocation model of Stage I fatigue crack growth and an analysis of Stage II to Stage I transition at low ΔK₁
  
  • Doquet Véronique
  Journal de Physique IV Proceedings, EDP Sciences, 2000, 10 (PR6), pp.145-150. Simulations of dislocations nucleation and glide ahead of a crystallographic mode II crack are performed for push-pull and reversed torsion. An influence of the normal stress on the friction of crack flanks, as well as on the condition for dislocation emission is introduced. The crack growth rates are deduced from the dislocation fluxes at the crack tip. A comparison between the loading modes is made. Taking into account the presence of grain boundaries, the repeated decelerations and sometimes the arrest that characterise Stage I crack growth are described by the model. An analysis of the transition from mode I to mode II crack growth observed at low ΔK₁ in single crystals is proposed. (10.1051/jp4:2000625)
  DOI : 10.1051/jp4:2000625
• Etude expérimentale du comportement dynamique des matériaux
  
  • Gary Gérard
  • Zhao H.
  Mechanics & Industry, EDP Sciences, 2000, 1, pp.15-26. Le présent document rappelle la problématique des essais dynamiques, en particulier lorsqu'ils ont pour objet d'étudier le comportement des matériaux. Une attention particulière est portée au système des barres de Hopkinson en raison de son utilisation fréquente dans une gamme de vitesses de déformation allant de 50/s à 5000/s qui correspond à la gamme de vitesses de la plupart des applications industrielles civiles. On rappelle le principe de la mesure telle qu'elle est effectuée avec ce système, ses limites et ses points forts. Elle est ensuite illustrée par quelques résultats typiques obtenus sur divers matériaux et sur des structures à échelle réduite.